Sure, I can help you create a bridge chart in Excel! Here are the steps:

1. First, enter your data into a new Excel worksheet. Your data should have two columns: one for the category labels and one for the values. For example, you might have a column for "Previous Year" and a column for "Current Year."
   
2. Next, select the data and insert a bar chart. You can do this by clicking on the "Insert" tab in the ribbon, selecting "Bar Chart" from the chart options, and choosing the type of bar chart you want to use.
   
3. Once you have your chart, right-click on one of the bars and select "Format Data Series" from the menu.
   
4. In the Format Data Series pane, select "Series Options" and then check the box next to "Plot Series On Secondary Axis." This will create a secondary axis on the right side of the chart.
   
5. Next, right-click on the secondary axis and select "Format Axis" from the menu.
   
6. In the Format Axis pane, under "Axis Options," set the "Minimum" value to a negative number and the "Maximum" value to a positive number. This will create a bridge between the positive and negative values.
   
7. Finally, you can customize the chart as needed by adding titles, labels, and formatting options.

That's it! You should now have a bridge chart in Excel that shows the difference between two sets of data. Let me know if you have any questions or need further assistance.